Angular 2 : Route redirect with AuthGuard

Question

我有一个 Angular2 应用程序，如果用户未登录，它应该阻止到某个页面的路由。这是我的 app.routes 文件

export const routes: Routes = [
  { path: '', component: LoginComponent },
  { path: 'login', component: LoginComponent },
  { path: 'home', component: HomeComponent, canActivate: [AuthGuard] },
  { path: '**', component: LoginComponent },
];

和我的 AuthGuard 文件

@Injectable()
export class AuthGuard implements CanActivate {
response: ResponseInterface;

constructor(private router: Router, private localStorage: LocalStorageService,
 private services: MyService) { }
canActivate() {

let token = String(this.localStorage.get('token'));
if (token != null) {
  this.services.keepAlive(token).subscribe(
    response => this.response = response,
    error => alert(error),
    () => {
      if (this.response.status == 'OK') {
        console.log("response OK");
        return true;
      } else {
        console.log("response KO");
        this.router.navigate(['/login']);
        return false;
      }
    }
  )

} else {
  this.router.navigate(['/login']);
  return false;
}

现在，如果我尝试导航到 http://localhost:4200/#/home path 并且我已经将 token 存储到 localStorage 中，没有任何反应:主页未显示并且导航栏上的路径变为 http://localhost:4200/#/ .怎么了？

Answer 1

canActive方法应返回 Observable<boolean> , Promise<boolean>或 boolean .

您正在订阅 this.services.keepAlive可观察并返回 boolean订阅回调的值，而不是将其返回给 canActivate方法。更改您的代码如下:

canActivate(): Observable<boolean> | Promise<boolean> | boolean {
    let token = String(this.localStorage.get('token'));
    if (token != null) {
        return this.services.keepAlive(token)
            .map(response => {
                if (response.status == 'OK') {
                    console.log("response OK");
                    return true;
                } else {
                    console.log("response KO");
                    this.router.navigate(['login']);
                    return false;
                }
            });
    } else {
        this.router.navigate(['login']);
        return false;
    }
}

这样， bool 类型的 Observable ( Observable<boolean> ) 将返回给 canActive方法和路由解析应该按预期工作。